Task 3. Complete the sentences using the words in the box. You will need to use one word twice.
compression, deformation, elongation, extension, tension
1. A stretching force is called
2. A crushing force is called
3. Extension is also called
4. Tension causes .. or
5. Tension or compression cause
Task 4. Match the tivo parts to make correct sentences.
1. If a material is stiff
2. If a material is brittle
-
3. If a material is plastic
4. If a material yields
5. If a material fractures
6. If a material is elastically deformed ...
a) it is malleable and/or ductile.
b) it has low elasticity and low tensile strength.
c) it has low elasticity and high tensile strength.
d) it has been extended to a point before its elastic limit.
e) it has been loaded beyond its ultimate tensile strength.
1) it has been significantly plastically deformed, but not broken.​

Defects in vision, hearing, speech, or inability to move is limited by many people to communicate, learn, work and influence their environment.Personal computers, supplemented by special devices, and have the appropriate software, can reduce the impact of these defects.For disabled people's computers provide a good replacement for the lost capacity; allow more flexibility for special education; provide access to information not available to them in another way; provide new opportunities for education, work, communicate with people and leisure activities.Blind people can use computers with programs and devices to play it. With the help of computer speech synthesizer pronounces any words appearing on the screen. It provides access to the blind use computers most of the opportunities.In addition, the device and the pattern recognition software in combination with special devices allow computers to display printed text converted into tactile form Braille or speech. Thanks to these systems may blind yourself to read any book, magazine or newspaper without recourse to outside assistance.People with speech disabilities can also benefit from a computer synthesized speech. Keyboard input to the computer the messages you want to say, the dumb man can communicate by phone with a person who can not read.In addition, computerized messaging system is a means of rapid communication over long distances, especially valuable for those with speech or hearing damage, which is not possible using conventional phones.Computers largely also help people with reduced ability to move.Information systems provide people who are unable to go to the library, access to large banks of information.Computer-controlled manipulators (ie, the "hand" of the robot) can be programmed so that they perform the movement for a given program, and feel when in contact with objects. This allows lyudam with impaired motor ability to manipulate objects to perform actions such as eating, flipping pages in books and change a disc into the computer.Many people though do not lose the mobility of the hands or arms can not, operate on a standard computer keyboard. Special keyboard with large touch sensitive keys at the disposal of the people all of your computer.And people who can not work at all; neither coca keyboard voice can control your computer using a speech recognition device. For people with serious violations of voice and motor functions, developed special input device to enable, use a computer for communication and other purposes.Other systems, as has already been created and are in the stage of development and testing, include portable terminals that allow deaf people to send messages from any phone and take them.

Камчатский бурый медведь очень, очень большой. Он может весить 400 кг. Когда он встает, он может быть 2,50 м в высоту. Он очень сильный, с большими зубами и длинными острыми когтями. Эти большие животные обычно очень спокойны - в отличие от сибирских медведей. Большую часть года они живут в густых лесах и едят ягоды, орехи и корни. В летние месяцы миллионы лососей плывут по рекам Камчатки с моря. Эти рыбы - любимая еда медведей. Медведи путешествуют на сотни километров, чтобы жить рядом с реками и ловить лосося. Медведи очень хорошие пловцы, и их толстый мех держит их в теплой ледяной воде. Когда лето заканчивается, медведи возвращаются в лес. Там они делают теплый день, где они могут провести зиму.